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CVE-2025-12385: Improper validation of <img> tag size in Text component parser

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-03 · updated 2026-10-18
• Weakness: CWE-770

Description

Allocation of Resources Without Limits or Throttling, Improper Validation of Specified Quantity in Input vulnerability in The Qt Company Qt on Windows, MacOS, Linux, iOS, Android, x86, ARM, 64 bit, 32 bit allows Excessive Allocation. This issue affects users of the Text component in Qt Quick. Missing validation of the width and height in the <img> tag could cause an application to become unresponsive. This issue affects Qt: from 5.0.0 through 6.5.10, from 6.6.0 through 6.8.5, from 6.9.0 through 6.10.0.

Affected products

• Qt: from 5.0.0 through 6.5.10; from 6.6.0 through 6.8.5; from 6.9.0 through 6.10.0

References

• https://codereview.qt-project.org/c/qt/qtdeclarative/+/687239
• https://codereview.qt-project.org/c/qt/qtdeclarative/+/687766

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